Using large-scale dynamical cluster quantum Monte Carlo simulations, we explore the unconventional superconductivity in the hole-doped Hubbard model on the triangular lattice. Due to the interplay of electronic correlations, geometric frustration, and Fermi surface topology, we find a doubly degenerate singlet pairing state at an interaction strength close to the bare bandwidth. Such an unconventional superconducting state is mediated by antiferromagnetic spin fluctuations along the Γ-K direction, where the Fermi surface is nested. An exact decomposition of the irreducible particle-particle vertex further confirms the dominant component of the effective pairing interaction comes from the spin channel. Our findings suggest the existence of chiral d+id superconductivity in a hole-doped Hubbard triangular lattice in a strongly correlated regime, and provide insight into the superconducting phases of the water-intercalated sodium cobaltates NaxCoO2· yH2O, as well as the organic compounds κ-(ET)2X and Pd(dmit)2. © 2013 American Physical Society.
Publication Source (Journal or Book title)
Physical Review B - Condensed Matter and Materials Physics
Chen, K., Meng, Z., Yu, U., Yang, S., Jarrell, M., & Moreno, J. (2013). Unconventional superconductivity on the triangular lattice Hubbard model. Physical Review B - Condensed Matter and Materials Physics, 88 (4) https://doi.org/10.1103/PhysRevB.88.041103